<p>MySQL raises this error when a statement references a partition name that does not exist in the target table.</p>
<p>MySQL Error 1735: ER_UNKNOWN_PARTITION occurs when a query names a partition that the referenced table does not contain. Verify the partition list with SHOW CREATE TABLE and rerun the statement with a valid partition name or remove the PARTITION clause to resolve the issue.</p>
Unknown partition '%s' in table '%s'
Error 1735 triggers when MySQL cannot find the partition specified in a DML or DDL statement. The full message is: Unknown partition '%s' in table '%s'.
The server stops processing the statement because the named partition does not exist in the table definition. Any operation that lists partitions - SELECT, INSERT, UPDATE, DELETE, ALTER TABLE, EXCHANGE PARTITION - can raise this error.
The error surfaces immediately during parsing or execution if a PARTITION clause references a non-existent partition. It can also occur after schema changes that renamed or dropped partitions without updating application code.
Leaving the error unresolved blocks data access, prevents maintenance tasks, and may hide deeper schema drift. Rapid resolution ensures query reliability and keeps partition management consistent.
Most cases involve typos in partition names or outdated scripts that still refer to removed partitions. Mismatched case on case-sensitive filesystems can also trigger the error.
Another cause is restoring a table without all partitions or altering partitioning rules without revising stored procedures.
First, inspect the table definition with SHOW CREATE TABLE to list valid partitions. Correct the statement to use an existing partition.
If the partition really should exist, recreate it with ALTER TABLE ... ADD PARTITION or restore it from backup.
An ETL job might run SELECT … PARTITION(p_2024q1) after the partition was pruned. Update the job to target p_2024q2 or remove the clause.
A DBA may attempt an EXCHANGE PARTITION on a misspelled partition. Verify spelling before rerunning.
Automate partition creation and retirement with tested scripts. Keep application configuration in sync with schema changes by storing partition metadata in version control.
Use Galaxy’s AI copilot to autocomplete partition names directly from the live schema, reducing human error.
Error 1509 (ER_PARTITION_MISMATCH) arises when exchanging incompatible tables. Ensure identical structure before exchanging.
Error 1503 (ER_PARTITION_CLAUSE_ON_NONPARTITIONED) appears when a PARTITION clause is given for a non-partitioned table. Remove the clause or partition the table first.
A misspelled or case-mismatched partition identifier is the most frequent trigger.
Maintenance scripts may remove or rename partitions, leaving legacy code pointing to the old names.
Applications that build partition names dynamically may generate an invalid name due to logic errors.
Backups or migrations that exclude certain partitions lead to mismatches during subsequent queries.
Occurs when EXCHANGE PARTITION tries to swap tables with differing structures.
Raised when a PARTITION clause is supplied for a table that is not partitioned.
Happens when partition values are outside the defined range or list.
No data is corrupted; the statement simply fails. However, repeated failures can block critical jobs.
No. MySQL must validate partition names to ensure correct data routing.
Use SHOW CREATE TABLE or query INFORMATION_SCHEMA.PARTITIONS for programmatic access.
Galaxy autocompletes partition names from metadata and flags invalid names before execution, reducing runtime errors.
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